Sinclair, 27, died late Friday night in hospital after what Prime Minister Stephen Harper called an "unfortunate incident" at CFBPetawawa.
Sinclair, who was a member of the 2 Service Battalion, was on a training program with The Royal Canadian Dragoons at the time of the incident. According to Canadian Forces spokesman Lt. Jean-Francois Carpentier, Sinclair joined the military in 2012.
Lt.-Col. Carla Harding, Commanding Officer of 2 Service Battalion, will make a brief statement at 2 p.m. ET Sunday, according to a Canadian Forces news release.
Sinclair died "surrounded by family and friends moments before midnight," Commander of the Canadian Army Lt.-Gen. Marquis Hainse said in a written statement.
"This incident is another painful reminder of the sacrifice that our brave men and women in uniform face daily in the defence of our nation’s freedoms and liberties, both at home and abroad," Harper said in his own statement on Saturday.
Defence Minister Rob Nicholson called it a "tragic event." His department said it will not release any further information about the circumstances of the incident because the matter is under investigation.
Earlier Saturday, Nicholson mistakenly said Sinclair died on Thursday.