The debate will take place at the party's Ard Fheis tomorrow.
The party had always opposed the Offences Against the State Act until last year when it abstained.
Sinn Féin TDs walked out of the Dáil before the vote on the legislation this year.
A motion going to Sinn Féin members tomorrow says the Special Criminal Court as currently constituted doesn't have a place in the courts system but juryless trials may be acceptable in exceptional circumstances.
