Vollmann was head coach of Rot-Weiß Lüdenscheid between 1 July 1993 to 30 June 1995.
Vollmann was head coach of the reserve team of SG Wattenscheid 09 between 1 July 1995 and 30 October 1995. He won two of his 14 matches as head coach.[1]
Vollmann was head coach of Preußen Münster from 1 July 1996 to 30 June 1998.[4] His first match was a 1–0 win against SV Elversberg.[5] They finished the season in fifth place.[6] In the next season, they lost 3–2 against the reserve team of 1. FC Kaiserslautern.[7] The team finished eighth in the league.[8]
Vollmann was head coach of Eintracht Trier from 1 July 1998 to 6 October 1999.[9] His first match was a 3–0 win against Rot-Weiß Oberhausen.[10] He departed from the club on 6 October 1999,[9] three days after a 1–1 draw against Preußen Münster.[11] The club won six out of 12 matches.[11]
Vollmann was head coach of KFC Uerdingen 05 from 1 November 1999 to 30 June 2000.[12] His first match was a 1–1 loss to SC Verl.[13] He won nine of his 19 matches.[13]
Vollmann was head coach of Fortuna Köln for 1 July 2000 to 30 June 2001.[14] His first match was a 2–2 draw against Borussia Dortmund II.[15] They finished the season in fourth place[16] and was knocked out of the German Cup in the first round by Bayer Leverkusen.[17]
Eintracht Braunschweig
Vollmann was hired by Eintracht Braunschweig on 31 May 2001.[18] His term started on 1 July 2001.[19] His first match was a 4–0 win against the reserve team of Bayer Leverkusen.[20] In the 2001–02 season, Eintracht Braunschweig finished in second place and was promoted to the 2. Bundesliga.[21] In the 2002–03 season, Eintracht started with a 4–2 win against Waldhof Mannheim.[22] This was followed by a 2–0 loss to Rot-Weiß Oberhausen.[22] Then Eintracht's next two matches were against SSV Reutlingen 05 (once in the league and once in the cup).[22] Both matches were lost by a 2–1 scoreline.[22] His next three matches were all losses[22] and were outscored 12–1.[22] This includes a 7–1 loss to FC St. Pauli.[22] He was sacked on 20 October 2002.[23] He had lost to Karlsruher SC 2–1 earlier in the day.[24]
Return to Preußen Münster
2002–03 season
Vollmann returned to Preußen Münster on 19 December 2002.[25] His first match in his return was a 3–0 loss to Rot-Weiss Essen[26] on matchday 21,[27] on 1 March 2003.[26] Then Preußen Münster went on a five–match undefeated streak (four wins and one draw).[26] Then, on matchday 27, on 19 April 2003, the undefeated streak finished with a 2–0 loss to Erzgebirge Aue.[26] The team finished with a record of 3 wins, 2 draws, and two losses to close out the 2002–03 season.[26] The club finished in 12th place in the league table.[28]
2003–04 season
Vollmann was sacked on 10 November 2003,[29] two days after losing to Eintracht Braunschweig.[30] Preußen Münster was in the relegation zone at 17th place with a record of one win, five draws, nine losses, and eight points at the time of the sacking.[31]
Holstein Kiel
Vollmann was named head coach of Holstein Kiel on 26 February 2004[32] and was in that position until 30 June 2004[14] when Frank Neubarth became head coach.[32] His first match was a 3–0 loss to KFC Uerdingen 05 on 28 February 2004.[33] He was head coach for 15 matches; winning five.[30] Holstein Kiel finished the season in 12th place.[34]
Return to Holstein Kiel
2006–07 season
He returned to Holstein Kiel as Sporting Director in the 2006–07 season.[35] On 26 February 2007, he sacked Stefan Böger and appointed himself as head coach.[35] His first match as head coach was a 1–1 draw against VfB Lübeck.[36] At the end of the season, Holsten Kiel were tied with Union Berlin, Rot Weiss Ahlen, and Borussia Dortmund II with 48 points.[37] However, Holsten Kiel lost the tiebreaker scenario and were relegated to the Oberliga.[37]
2007–08 season
Despite the relegation, Vollmann remained as head coach.[38] Holstein Kiel started the 2007–08 season with a 5–0 loss to Hamburger SV in the German Cup on 5 August 2007.[39] The season included an 8–0 win against VSK Osterholz-Scharmbeck and two nine–match undefeated streak from 10 August 2007 to 5 October 2007 and from 19 October 2007 to 2 March 2008.[39] To start the 2008–09 season, Holstein Kiel lost to Hansa Rostock in the German Cup.[40] They were promoted after winning North division of the Oberliga.[41]
Hansa Rostock hired Vollmann on 31 May 2010.[43] His first match was a 3–0 win against VfR Aalen,[44] on matchday one,[45] on 24 July 2010.[44] Then they won two and lost one over their next three matches.[44] Hansa Rostock faced 1899 Hoffenheim in the 2010–11 German Cup which Hoffenheim won 4–0.[46] After this, Hansa Rostock went on a four–match undefeated streak.[44] They finished the 2010–11 season with a 2–0 win against Rot Weiss Ahlen.[44] They finished in second place and won promotion to the 2. Bundesliga.[47] Vollmann was sacked on 6 December 2011,[48] three days after losing 3–0 to Greuther Fürth.[49] Hansa Rostock was on a six–match winless streak at the time of the sacking.[49]
Wehen Wiesebaden
Vollmann replaced Gino Lettieri on 16 February 2012.[50] His first match was a 4–0 win against SV Sandhausen on 18 February 2012.[51] He started his tenure with a five–match winless streak (two draws and three losses).[51] His first victory was a 3–2 win against 1. FC Saarbrücken on 17 March 2012.[52] The club finished the 2011–12 season in 16th place.[53] In the 2012–13 season, the club got to the Hesse Cup final where they lost to SV Darmstadt 98 4–0.[54] They also finished in seventh place in the league.[55] He was sacked on 21 October 2013,[56] two days after losing 2–0 to SpVgg Unterhaching.[57] They were on a five–match winless streak at the time of the sacking.[57] He had won 20 of his 65 league matches as head coach.[14]
Return to Hansa Rostock
2014–15 season
Vollmann was announced as Dirk Lottner's replacement on 13 May 2014.[58] His first match in his return was a 4–3 win against Preußen Münster[59] on matchday one,[45] on 27 July 2014.[59] He then failed to win any of his next five matches (two draws and three losses).[59] Then they won 2–0 against 1. FSV Mainz 05 II before losing their next two matches.[59] Then they defeated Aeminia Bielefeld 4–2.[59] After this, they went on a six–match winless streak which finished with a 4–1 win against VfB Stuttgart II.[60] He was sacked on 7 December 2014.[61]
VfR Aalen
He was appointed as the head coach of VfR Aalen on 12 June 2015.[62] He made his debut on 25 July 2015 against Chemnitzer FC.[63] The match finished in a 0–0 draw.[63] His spell ended in 2018.[64]