Dewalt is not going to make an accessory for you to do so, since that sander was designed to use 1/4 sheet sandpaper, and therefore takes standard paper clamped in place. You could make your own base for the sander out of thin plywood or some other suitable material, covered perhaps with a laminate or rubber surface, that would accept PSA (pressure sensitive adhesive) sandpaper, which you can buy in rolls appropriately sized for your sander. Or you can try some kind of after-market conversion kit such as this one
(See also here
If you really want a hook and loop base on your sander, I recommend you bite the bullet and simply purchase a random orbital sander with a H&L pad. Then you'll of course have to buy the perforated paper discs to go with it....
But you'll easily be able to change grits, and the performance and quality of your sanding will improve.
You might check the reviews in various woodworking magazines before you make a purchase, just so you know what you're likely to get for your money. There's a vast array of machines made, and the quality varies accordingly, and depends to some extent on your budget and intended use.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!