Lim Hyo-Jun is sentenced to pay 3 million won (around SEK 24,000) and must also undergo 40 hours of therapy aimed at sexual offenders, said a spokesman for the Central Prosecutor's Office in South Korea's capital Seoul.
The 23-year-old took Olympic gold at 1,500 meters in Pyeongchang 2018, and also won a bronze medal of 500 meters from the Games.
The abuse happened in June last year when Lim pulled down his pants on a younger teammate before the eyes of others in the team at the country's national training facility.
It is far from the first time that the extremely successful short track nation - where the competition desire is recognized great - is overshadowed by scandals.
Among other things, two-time Olympic gold medalist Shim Suk-Hee told us last year that a former coach raped and sexually exploited her. She also said there were more victims of sexual abuse in sports. The coach was sentenced to 1.5 years in prison.