Moriyasu was born in Kakegawa on August 23, 1968. After graduating from Nagasaki Nihon University High School, he joined Japan Soccer League club Mazda (later "Sanfrecce Hiroshima") in 1987. In 1992, Japan Soccer League was folded and the club joined new league, J1 League. The club won the 2nd place in 1994 J1 League and 1995 and 1996 Emperor's Cup. In 1998, he moved to Kyoto Purple Sanga on loan. In 1999, he returned to Sanfrecce. He played 271 matches and scored 34 goals for the club until 2001. In 2002, he moved to newly was promoted to J1 League club, Vegalta Sendai. He retired end of 2003 season.