Sim Jae-won (born 11 March 1977) is a South Korean footballer.
His previous club was Busan I'Park, Gwangju Sangmu Bulsajo in South Korea and Eintracht Frankfurt in Germany and Changsha Ginde in China.
He has played in the 1997 FIFA World Youth Championship for the South Korea national team and at the 2000 Summer Olympics for the South Korea national team.
Sim has represented South Korea in senior team squads from 1998 to 2001. His A-match first goal was 5 April 2000, against Laos at Dongdaemun Stadium for Asian Cup first qualification match.