Nashville's Bridgestone Arena will host the tournament in 2015-17, 2019-21 and 2023-25, sources said. ESPN previously reported in May that St. Louis and Tampa, Fla., would host an SEC tournament and it appears they will split the 2018 and 2022 tournaments.
Atlanta's Georgia Dome already had been awarded the 2014 tournament.
The SEC and Nashville will officially announce the agreement at an Oct. 15 news conference at Bridgestone Arena.
In May at the SEC spring meetings, Scott Ramsey, president and CEO of the Nashville Sports Council, told ESPN that Nashville "would pursue" the SEC tournament "aggressively and host the tournament as many times as they will allow."
Nashville had previously been awarded the 2015, 2016 and 2019 tournaments.
At the league meetings, SEC commissioner Mike Slive said the league athletic directors voted unanimously to "authorize the conference to explore a primary site for the men's basketball tournament."
Slive had said the reason the league was looking for a primary home for its men's basketball tournament is because of the success of the league's permanent sites in football (Atlanta) and baseball (Hoover, Ala.).
Nashville was considered the frontrunner for its central location among SEC members, the size of the city and the rave reviews it received after past tournaments. The completion of the Music City Center and building of more downtown hotels enhanced the city's profile.
Bridgestone Arena previously hosted the SEC men's basketball tournament in 2001, 2006, 2010 and 2013. It hosted the women's tournament in 2002, 2004, 2008, 2011 and 2012. The NCAA Women's Final Four comes to Nashville for the first time in 2014.
The first SEC men's tournament was held in 1933. Since then, the event has been held in 11 cities: Atlanta; Baton Rouge, La.; Birmingham; Knoxville, Tenn.; Lexington, Ky.; Louisville, Ky.; Memphis, Tenn.; Nashville; New Orleans; Orlando, Fla.; and Tampa.