Bour will be participating along with teammate Giancarlo Stanton, who is looking to defend his 2016 Home Run Derby title.
Bour said that Marlins outfield coach Lorenzo Bundy will pitch to him next Monday. Bour has hit 18 home runs this season, despite missing time due to injury.
According to Clark Spencer of the Miami Herald, Marlins All-Star Marcell Ozuna declined to join the Derby because he didn't want to mess with the timing of his swing.
Bour is trying to get into the All-Star Game next Tuesday, as he's a candidate for the NL's Final Vote.
He's competing against Cubs third baseman Kris Bryant, Rockies first baseman Mark Reynolds, Dodgers third baseman Justin Turner, and Nationals third baseman Anthony Rendon for the final spot on the NL roster.
Voting for the Final Vote ends on Thursday at 4 p.m. ET. Bour is looking to join Ozuna and Stanton as the Marlins representatives for the All-Star Game.