The pilot was landing to the south on a beach in his tailwheel-equipped Cessna 180 airplane. The pilot stated the wind was gusting about 35 knots across the beach. At the end of the landing rollout, the right tire impacted a sand drift and the pilot was unable to maintain directional control. The airplane entered a ground loop, sustaining substantial damage to the left wing and elevator. The pilot stated there were no preaccident mechanical malfunctions or anomalies with the airplane that would have precluded normal operation.