After retirement, Nagasawa started coaching career at Yamaha Motors. In 1991, he became a manager. He led the club to won the 2nd place at Japan Football League in 1993 and promoted to J1 League. He resigned end of 1993 season. He signed with Nadeshiko League club Suzuyo Shimizu FC Lovely Ladies in 1995. In 1997, he moved to Honda. In 1999, he signed with Sony Sendai and managed until August 2001. From 2001, he managed some university and high school.