An international since 2008, Kamara was dropped from the national team set-up for "disciplinary reasons" in August 2019. He was recalled later that month. He retired from international duty in November 2019, blaming in part new manager Sellas Tetteh. Tetteh defended himself. Kamara later returned to the national team set-up and on 12 June 2021 Kamara scored the only goal for Sierra Leone in a victory against Benin which qualified Sierra Leone for the 2021 Africa Cup of Nations, their first since 1996.