After retirement, in 2001, Sorimachi signed with J2 League club Albirex Niigata and became a manager. In 2003, the club won the champions and was promoted to J1 League. He resigned end of 2005 season. In July 2006, he became a manager for Japan U-23 national team. He also served as assistant coach for Japan football team under manager Ivica Osim and Takeshi Okada until July 2007. At 2008 Summer Olympics qualifiers, he led U-23 Japan to won qualify for 2008 Summer Olympics. However at 2008 Summer Olympics, Japan lost all 3 matches. In 2009, he signed with his former club Shonan Bellmare (former "Bellmare Hiratsuka"). In 2009, the club won the 3rd place in J2 and was promoted to J1. However the club finished at the bottom place in 2010 and was relegated to J2 in a year. In 2012, he moved to Matsumoto Yamaga FC which was promoted to J2 from 2012 season. In 2014, the club won the 2nd place and was promoted to J1. However the club was relegated to J2 in a year. In 2018, the club won the champions and was promoted to J1 again. However the club was relegated to J2 in a year and he resigned end of 2019 season.