Sinclair was the best in Field Hockey at Stanes Higher Secondary School, Coimbatore. He was the captain of the school team and under his captaincy the school won many tournaments. He was elected "Head Boy" for 2001. He was also the captain of the "Panthers" and led them to victory in the Intra-School Sports Event in 2001. He did his further studies in PSG College of Arts and Science, Coimbatore.