Yes, it is possible to reupholster a sectional sofa. The process involves removing the old fabric from the sofa and replacing it with new fabric. This can be done by a professional upholsterer or by someone with experience in upholstery. However, it is important to carefully measure the sofa and choose a durable and high-quality fabric that will hold up to wear and tear. Though this process is time-consuming and labor-intensive, but it can also be a cost-effective way to give an old sofa a new lease on life.