Police prosecutor Sergeant Roger Schreuder said police believed Song should be sent to prison because of the effect offending of this type had on Rotorua's tourist industry.
He said a community-based sentence would see Song go straight back into the same environment where the assault happened.
Mr Schreuder said a report revealed Song had been having marital issues and was "in awe of the victim's size".
"These same things will be there today, tomorrow, the next day, the same trigger points," Mr Schreuder said.
However Judge Weir said Song had no previous convictions, had pleaded guilty early and was remorseful.
He said Song and his wife had suffered significantly financial loss and had received numerous abusive phone calls after his last court appearance.
Judge Weir said the main issue was the breach of trust.
"You chose to indecently assault this young woman," he said. "To her a motel is a safe place but because of you the motel was not a safe place."
In her victim impact statement, the woman said Song shouldn't be a motelier, the judge said.
"At the end of the day that's a matter for you and whether or not you can financially survive this episode," he told Song.