The 47-year-old actor said the movie is a tribute to the warriors of Battle of Saragarhi.
"Unveiling @SonsOfSardaar My tribute to Warriors of Saragarhi: A tale of Rage, of Love, of Bravery. #SonsOfSardaar," Devgn posted.
"Sons of Sardaar" will tell the story of the 21 Sikhs who fought to death in the 1897 Battle of Saragarhi.
Details about the film are yet unknown.
Devgn is currently busy with his directorial venture "Shivaay", which is slated to release this Diwali.