According to the airport manager, the wind was reported to be from the southwest at 8 to 10 knots, with higher gusts. The pilot stated that on the landing rollout he encountered a gusting, quartering tailwind, which lifted the left wing and caused the airplane to veer to the right side of the runway. The airplane then ground looped into the soft sand beside the runway. The pilot said there were no mechanical malfunctions or failures of the airplane.