A statement from the opposition government said its head Ahmad Tohme had "decided to disband the Supreme Military Council and refer its members to the government's financial and administration committee for investigation".
The decision came amid widespread reports of corruption within the ranks of the FSA, which is backed by Western and Arab governments in its battle to overthrow the regime of President Bashar al-Assad.
The government in exile said it was also sacking FSA chief of staff Brigadier General Abdelilah al-Bashir.
But hours later, the Syrian National Coalition led by Ahmad Jarba said in a statement the "head of the interim government has exceeded his powers".
It said it had decided to "instruct the General Council to comment on this abuse of power at its next meeting and to take the appropriate action".
The next General Council meeting will be in Istanbul from July 4 to 6.
"This crisis reflects the conflict in the coalition and is in a regional context. Qatar supports the government of President Ahmad Tohme and Ahmad Jarba is close to Saudi Arabia," a senior coalition official told AFP, on condition of anonymity.
"He wants to prepare to keep control. It seems he plans to form a High Council of the Syrian Revolution, a military body which he will chair and will have no relationship with the opposition government," he added.
In order to do so, the official said, Jarba would demand a vote of confidence and a new government chief, and Tohme decided to pre-empt the move.
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