In 2015, Kovalainen moved to Japan to compete in Super GT (GT500 class) with Lexus. In his first season of Super GT, he drove the Lexus RC F GT500 for SARD with Kohei Hirate. The following year Kovalainen and Hirate won the Super GT championship: after going into the season's closing double header at Twin Ring Motegi in fourth place in the standings, they qualified on pole and led most of the first of the two races before dropping down to second, subsequently taking their only win of the season in the final round to clinch the title. The championship win was Kovalainen's first since winning the Nissan World Series in 2004. After the end of the 2021 season, Kovalainen announced that he would retire from the series.
