Sanjai was born on May 2, 2005, in Tiruchengode, Namakkal, Tamil Nadu. He currently resides in the same locality with his family. His father, Sureshkumar, works as a painter, while his mother, Sumathi, is a typist. Sanjai has an elder brother named Dharun. At the age of 16, Sanjai developed an interest in kabaddi simply because he loves the sport. He primarily plays as a Right Raider and specializes in Hand Touch maneuvers. Under the guidance of Coach Nithi from Annai Tamil Club, Sanjai hones his skills at the PK Sports facility located in his hometown. While Sanjai doesn't have a favorite player, he admires the Rotation technique in kabaddi. Apart from kabaddi, he enjoys playing volleyball and actively participates in other sports. Currently pursuing his second year of B.Sc in Electronics and Communication, Sanjai's participation in the Yuva Kabaddi Series marks his debut in competitive kabaddi. His aspirations include securing a government job in the future.