Sahil Suhaimi made his S.League debut as a 17-year-old against Étoile FC in 2010 as a midfielder and impressed against the more physical French side but National Service restricted further appearances.

Throughout the 2013 S.League season, Sahil impressed with his flair, technical ability, dribbles and his willing attitude to pressure opposing defenders.

[6] On 28 February 2015, Sahil then went on to notch a brace in the LionsXII's opening game of the 2015 Malaysia FA Cup, after coming as a half-time substitute, to help the Lions win 4–0 against Kedah United and send the Singaporean outfit into the Round of 16.

[10][11] After returning from England, on 23 May 2017, Sahil secured a move to Sarawak FA as one of their foreign players ahead of the 2017 Malaysia Super League season playing alongside former Tampines Rovers striker, Mateo Roskam.

During the 2022 AFC Cup group stage match, he scored a brace against Laos club, Young Elephants in a 3–1 victory.

During the 2013 SEA Games, Sahil played a key role as the Singapore U23 team won the Bronze, and finished as joint top scorers in the tournament.

However, he disappointed throughout the tournament only managing to find the net once against Cambodia in a breakaway, as Singapore were knocked out in the group stages after losing 0–1 to Indonesia and Myanmar 1–2.