The Crown introduced the single charge, involving a new alleged victim, during Bertrand Charest's brief court hearing Friday.
It brings the total number of alleged victims to 12 and the number of charges, including sexual assault and breach of trust, to 57.
The latest alleged victim came forward recently and says she was sexually assaulted in Whistler, B.C., in the late 1990s.
The initial incidents allegedly took place between 1991 and 1998 in Mont-Tremblant, north of Montreal, and in France, Austria, New Zealand and the United States.
The alleged female victims were all between 12 and 18 and Charest was in a position of authority as a coach.
Charest worked with Alpine Canada's women's development team between 1996 and 1998.
He has been detained since his arrest on March 10 and has announced his intention to fight a decision to deny him bail.
A hearing before Quebec Superior Court is scheduled for June 25.