Steve McCormack is the son of the former rugby league footballer for Oldham, James"Jim" McCormack. His first coaching appointment was in 2001, at Salford City Reds, which made him at the age of 28 the youngest coach in the Super League. He was sacked 10 months later, after a run of poor results. He later won National League One Coach of the Year having twice taken Whitehaven Warriors to the Grand Final but losing to Leigh Centurions (2004) and Castleford Tigers (2005) to miss out on promotion to Super League.
He was appointed coach of Widnes Vikings after the club's relegation from Super League in 2005 and the subsequent departure of Frank Endacott. In his first season with Widnes he led the club to the National League One grand final where they subsequently lost to the Hull Kingston Rovers. During the 2007 season McCormack won the Northern Rail Cup beating his old side Whitehaven Warriors 56–6 in the final at Blackpool. McCormack was soon after rewarded with a new 2-year contract keeping him with Widnes until the end of the 2009 season. Widnes failed to gain promotion to Super League losing out to Castleford Tigers in the 2007 National League One Grand Final. In October 2007 Steve McCormack left Widnes and joined the Hull Kingston Rovers as assistant coach to Justin Morgan. However, nine days later after leaving Widnes Vikings, Steve returned as head coach with a new set up after Steve O'Connor took over the club. In February 2009 Steve parted company with Widnes and this is thought to have happened after a poor performance against Oldham. He was taken over by assistant John Stankevitch in a caretaker role. On 22 October 2009 he was named as the new head coach of Barrow Raiders.
McCormack resigned from Barrow at the end of the 2010 season and moved to Swinton Lions for the 2011 season, before leaving prior to the 2013 Championship season.