The court was told Sharma raped the woman, whom he met in a city bar in February 2006, after driving her to a park.
After the attack, he allowed her to drive and fell asleep in the passenger seat so she drove him to Auckland Central police station, the New Zealand Herald reported on Wednesday.
Detective Simon Welsh told the paper, "I almost couldn't believe it when the call first came in. It's a unique case. She showed a lot of bravery and common sense."