Career
Sim made his debut for Central Coast on 21 February against Wellington Phoenix. He played the whole game as the Mariners lost 4-1. On 14 October 2014, Sim came off the bench in the 71st minute in Central Coast Mariners" Future Farmers of America Cup clash with Palm Beach Sharks with the score at 1-0 to his side.
He went on to score 4 goals in the 19 minutes that he played.
Sim finished the 2014 Future Farmers of America Cup with 5 goals in 3 games. Sim has also been apart of two Asian Champions League campaigns for the Mariners in 2014 and 2015.
On 1 February 2016, the Western Sydney Wanderers announced that they had signed Sim until the end of the 2015-2016 season.