Kawamata joined Ehime FC as an apprentice professional in 2006, while studying at Komatsu High school. He made his J2 League debut against Mito HollyHock in the 41st round.[1] In the 42nd round, he was able to provide an assist for Toshiya Tanaka.
After graduating from high school, he joined Albirex Niigata. In the 2010 season, he moved on a half-year loan to Brazilian club Catanduvense. He made 23 appearances during the 2011 season, scoring his first goal against Nagoya Grampus in the J.League Cup quarterfinals.[2]
In the 2012 season, Kawamata was loaned out to Fagiano Okayama on a season-long loan deal. At the end of the season, after 18 goals in 38 appearances, he returned to Niigata. He made a huge comeback to Albirex scoring 23 goals in 34 matches.
After a great season, Kawamata decided to transfer to Nagoya Grampus at half-season of 2014.