From 2009 to 2010, he and his former national teammate and close friend, Hong Myung-Bo, worked together as a part of the coaching staff for the South Korea U-20 and U-23 team. In 2010, Seo joined the coaching staff of the senior team under manager Cho Kwang-rae. Since 2012, he has been a member of the coaching staff of the Suwon Samsung Bluewings, becoming the club's manager in 2013.