 Musil won a silver medal in the 4 x 10 km at the 1933 FIS Nordic World Ski Championships in Innsbruck.At the 1936 Winter Olympics in Garmisch-Partenkirchen he finished ninth in the 50 km event and 14th in the 18 km competition.As a member of the Czechoslovak team he finished fifth in the 4x10 km relay event.