Born in Mizoram, Lalmuanpuia began his career with Shillong Lajong. He represented Lajong's youth side in the Shillong Premier League, where he was top scorer in 2015, and the I-League U19.[2] He made his professional debut for the club on 21 February 2016 against DSK Shivajians. He started the match and played the entire first half as Shillong Lajong were held to a draw, 1–1.[3]