Islam was born on 5 June 2006, and grew up in the village of Choto Bangram, Rajshahi, Bangladesh.

[2] His mother ran a tea shop and worked from 5 a.m. to 11 p.m. each day to support the family.

[3] Islam developed an interest in archery after seeing competitors practice at a club located across the street from the tea shop.

[1] Islam was signed up for the SB Club in 2017 and showed talent in the sport; his coach noted "Sagor had something special in him, I sensed it as soon as he started practising.

"[3] His talent led to him earning a spot at the Bangladesh Krira Shikkha Protishtan, the national sports institute, in 2019.