Yoon represented her nation at international competitions. As a junior she participated at three World Junior Speed Skating Championships. At elite level she competed at the 2001 Asian Speed Skating Championships and the 2003 Asian Winter Games. Between 2001 and 2003 she had a total of three starts at national championships. She never became national champion, but won the silver medal at the 2001 and 2002 South Korean Allround Championships and two bronze medals at the 2003 South Korean Single Distance Championships.