 Jang won the silver medal in the freestyle 62 kg class at the 1996 Summer Olympics, where he defeated reigning world champion Elbrus Tedeyev of Ukraine 3–1 in the quarterfinals but lost to Tom Brands of United States 7–0 in the gold medal match.Jang accumulated another Olympic medal at the 2000 Summer Olympics, where he lost to eventual gold medalist Mourad Oumakhanov of Russia in the semifinals but beat 1997 world champion Mohammad Talaei of Iran in the bronze medal match.Jang participated in the 2008 Summer Olympics as an assistant coach of the South Korean national freestyle wrestling team.