Balbir Singh Sr. to Khalsa College, Amritsar. Finally, Balbir got the permission from his family to take the transfer to Khalsa College in 1942 and began intensive training and practice sessions under Harbail's guidance. Later, Harbail coached the successful Indian national hockey team at the Helsinki and Melbourne Olympics. Khalsa College had four hockey pitches. In 1942–43 Singh was selected to represent Punjab University, which, at that time, covered colleges from a large region consisting of undivided Punjab, Jammu & Kashmir, Sindh and Rajasthan. The Punjab University team won All India Inter-University titles with Singh as Captain three years in a row: 1943,
Sandeep Singh injured after being hit by an accidental gunshot in the "Shatabadi Express" train, while on his way to join the national team due to leave for the World Cup in Africa two days later. He was almost paralyzed and on the wheelchair for 1 year of his life. He was 20 at that time. Singh not only recovered from that serious injury but also established himself again and played world cup for India in 2010 Indian team. Filmmaker Shaad Ali has made a biographical film titled "Soorma" on Sandeep life. Diljit Dosanjh has played Sandeep Singh's role in the film.