RCMP say two parents came forward last July after finding inappropriate text messages from an adult man to their teenage son.
An investigation turned up another alleged victim and RCMP believe there could be more.
Nathan Labatt, who is 24, is charged with sexual exploitation, invitation to sexual touching and possession of child pornography.
He is to make his first court appearance in Humboldt, Sask., on March 23.
Police say Labatt was an active volunteer with Scouts Canada and the Roman Catholic and Ukrainian Catholic churches.
They say he went on several retreats and camps with the organizations between 2009 and 2014.
Anyone with information is asked to come forward. RCMP are especially asking parents to report any questionable text or social media conversations their children may have had.