Charest, 49, is already facing a total of 56 charges involving 11 alleged victims.
He was arraigned in March on charges including sexual assault and breach of trust involving girls and young women between the ages of 12 and 19 between 1991 and 1998.
Charest allegedly assaulted the women north of Montreal and in France, Austria, New Zealand and the United States.
He has been denied bail and detained since his arrest.
Alpine Canada said in a March statement it contacted the RCMP in 1998 about sexual-abuse complaints against Charest.
The organization said it opened its own investigation early in 1998 and then told Charest he was being removed as a coach.
Alpine Canada maintains it was not aware of the results of any RCMP investigation.