Evendi told CNN the public caning would be done “in one of the mosques in Banda Aceh.”
LGBT activists and human rights groups have condemned the sentence.
“Now they await a public flogging. A pluralist president like (Joko Widodo) should recognize the right thing to do here is to spare these two the rod.”
Gay sex is legal everywhere else in Muslim-majority Indonesia, a nation generally known to be moderate and tolerant.
He was sentenced to two years in prison after being found guilty of blasphemy. He had been accused of insulting Islam during his re-election campaign.
The trial was seen as a test of Indonesia’s religious tolerance, but the governor’s election defeat and then his sentencing appeared to be a victory for Indonesia’s conservative Muslims, who campaigned heavily against Ahok.