Transport and release of opossums is illegal in most states and is not recommended because survival of released animals is often severely reduced and can result in the creation of new problems near the release locations.
Opossums are not particularly wary and are relatively easy to live trap. Use box or cage traps (7-inch x 7-inch x 24-inch) and bait them with cat food, fish, fruit, or marshmallows. Set traps at dusk, near dens or in areas frequented by problem opossums.
Animal-proof any opening that may provide escape refuge prior to releasing trapped opossums on your property. Cover openings with sturdy galvanized wire or hardware cloth attached to the lower edge and buried underground, slanting outward one to two feet.
Very young opossums stay in the female's pouch, but, when older, cling to her back or remain close by. Anyone trapping during the breeding seasons should check for young that may have fallen off or been left behind. Either delay trapping until young are independent enough to be trapped or ensure the entire litter can be removed.
For assistance in resolving human-wildlife conflicts involving opossums contact a licensed wildlife control operator in your area.