AC長野パルセイロ
Sadatomi was born in Tokyo on July 5, 1979. After graduating from high school, he joined J1 League club Bellmare Hiratsuka (later "Shonan Bellmare") in 1998. Although he played several matches as defensive midfielder every season from 1999, he could not play many matches. In 2002, he moved to J2 League club Montedio Yamagata. In 2003, he moved to Regional Leagues club Okinawa Kariyushi FC and played 2 seasons. In 2005, he moved to Yokohama FC. In 2006, he moved to Arte Takasaki and played as regular player. In 2007, he moved to Regional Leagues club AC Nagano Parceiro. He played as regular player in 2 seasons and retired end of 2008 season.