Michael Hume, 47, was arrested on Tuesday in Merritt, and is facing charges of sexual assault, unlawful confinement and uttering threats.
The RCMP said the charges relate to an incident that occurred in Lytton earlier this month, but did not provide specifics.
Hume's arrest came just days before the BC Ambassador competition in Merritt, where a new team of young people will be chosen to represent the province over the coming year.
The BC Ambassador Program committee said Hume is no longer with the organization, and it will replace him with a new president once the event is over.
Hume also worked for the Lytton First Nation band council. He has previously been listed on the band's website as restorative justice manager and court liaison.
The band council issued a statement late Thursday afternoon saying that Hume has been "relieved ... of his duties until more is known."
The council said it will co-operate with the RCMP in any way that it can.
Hume has been released on bail and is expected to appear in court in Kamloops on Sept. 4.