Having previously represented Sierra Leone at under-20 level, Kamara made his senior debut for Sierra Leone against Liberia on 26 July 2018.[5] He represented Sierra Leone at the 2019 WAFU Cup of Nations.[6] He did not travel to Kono to play a friendly match in November 2019 after suffering a bereavement, but received a two match international ban from the Sierra Leone Football Association after it was discovered he played a community match in Freetown during this period.[6]
Kamara was called up to Sierra Leone’s squad for the 2021 Africa Cup of Nations tournament, which began in January 2022.[7] He scored his first international goal with a “magnificent left-footed strike” in a 2–2 draw with Ivory Coast in Sierra Leone’s second group match on 16 January 2022.[1][8] He appeared in their third group match as they were eliminated from the competition after a 1–0 defeat to Equatorial Guinea.[9]