Can I move from Maryland if on probation

It would depend on what the probation requirements of the state where the probation was issued.  Many states are members of interstate compacts, or agreement between states on such subject, that set up unifiorm regualtions for such arrangements.  I would first chekc with the state wee the probation was issued before making such a move and see, under the terms of your partiuclar probation there, that such a move would be allowed first by them.