[1] He debuted for the senior team in a 5-2 loss against Pune FC on 30 January 2015, on which he came on as a substitute for Durga Boro in the 79th minute.

[9] On 22 August 2020, Sandeep was signed by Indian Super League club Kerala Blasters on a one-year contract.

[13] Sandeep was named in the Blasters squad for the 2021 Durand Cup and made 2 appearances for the club in the tournament.

[16][17] Sandeep made his first start of the 2022–23 Indian Super League season on 5 October in a 3–0 win against NorthEast United FC, where he assisted Sahal Abdul Samad's goal in injury time.

[19] On 22 January, during the final minutes of the away game against Mumbai City FC, Sandeep picked up an injury after colliding with Saviour Gama in the air while attempting to head the ball.

His younger brother, Dinesh Singh, is also a professional footballer and is currently playing for the Indian Super League club NorthEast United FC.