If there is court ordered restitution, then there is already a mechanism to collect it through the court. However, just as one can not squeeze blood from a turnip, someone unemployed and sitting in jail isn't going to have an income to go against for the payments.
You might check with your local prosecution office on how they generally handle enforcement of the restitution order.
If he owns any property you may be able to attach a lien on the property. If he does not own anything and is in jail then you may be out of luck. You should contact the victim's advocate to see if you can apply for victim's compensation fund money.
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