Sim was to have made his Masters debut. The 25-year-old Australian is one of the few players to have qualified for the Masters from world ranking points earned on the Nationwide Tour.
He had three Nationwide victories last year to earn promotion to the PGA Tour and got off to a strong start this season. He finished second to Ben Crane at Torrey Pines in January. He is expected sidelined another month.
Sim will not be replaced at the Masters, the only major that does not have alternates. His withdrawal Friday reduces the expected field to 97.