After graduating from Hosei University, he played for Yammer Diesel (later Cerezo Osaka) from 1979 to 1990.
After retirement, Sowa started coaching career at Cerezo Osaka in 1994.
In 1997, he moved to Japan Football League club Sagan Tosu and served as a manager.
In 2004, he signed with Japan Football League club YKK AP (later Kataller Toyama).
This biographical article related to a Japanese association football midfielder born in the 1950s is a stub.