The 2021 Southern Modified Auto Racing Teams was the 17th season of the SMART Modified Tour, and the first full season since 2004 (there were four races held by the series in 2020 due to the COVID-19 pandemic). It began with the Smart Chevrolet 99 at Caraway Speedway on March 14. It ended with the Rodney Cook Classic at Ace Speedway on October 23. Burt Myers won his second championship in the series, 23 points ahead of series runner up John Smith.