You hire a lawyer to make a motion to modify and or terminate the shared parenting plan. Often in these cases it is sometimes better to modify than to terminate; however with him being in Utah this might not be the case. Plans are modifiable or terminable by agreement of the parties and by court order. He may also be in contempt of the relocation notice requirement that is included in all Ohio shared parenting plans. You have a good case. Talk to a lawyer sooner rather than later.
This answer is provided for general purposes only. If you need legal assistance you should consult with an attorney. Responding to questions DOES NOT create an attorney-client relationship.