A Saskatchewan aboriginal group says granting parole to a man who sexually assaulted young boys at a residential school is "a slap in the face" to his victims.

The Federation of Sovereign Indigenous Nations says it's outraged at the decision in April by the Parole Board of Canada in the case of Paul Mary Leroux.

In December 2013, Leroux was convicted of indecent assault and gross indecency for attacks on young boys while he was a dormitory supervisor at the Beauval Indian Residential School between 1959 and 1967.

He was sentenced to three years in prison, but that was overturned on appeal by the Crown and changed to eight years.

Parole board spokesman Patrick Storey says the decision notes that Leroux does not accept full responsibility for his actions, but also that he is considered a low risk to reoffend.

FSIN Chief Bobby Cameron says the legal and judicial process surrounding the case has revictimized the residential school survivors Leroux assaulted.