This is not an easy undertaking, but you may be able to save the plant: The roots go quite deep; sometimes back hoes are required to capture all of them, but if you say so… Cut the vine back to the most vigorous cane, leaving about 8 inches. You can plant in early spring or fall. In preparation for relocation, dig a hole that is twice as wide as the roots, and loosen the soil to a depth that matches the length of the vertical roots. Set the plant at the same level or deeper than the surrounding soil surface. Stake it. Water vigorously for a year (in season), and keep it weeded.
All in all, it might be a lot easier to start a cutting from it or purchase a new vine. But then, the satisfaction to be derived from transplanting this vine might be priceless.
This is not an easy undertaking, but you may be able to save the plant: The roots go quite deep; sometimes back hoes are required to capture all of them, but if you say so… Cut the vine back to the most vigorous cane, leaving about 8 inches. You can plant in early spring or fall. In preparation for relocation, dig a hole that is twice as wide as the roots, and loosen the soil to a depth that matches the length of the vertical roots. Set the plant at the same level or deeper than the surrounding soil surface. Stake it. Water vigorously for a year (in season), and keep it weeded.
All in all, it might be a lot easier to start a cutting from it or purchase a new vine. But then, the satisfaction to be derived from transplanting this vine might be priceless.