Position rack in center of oven and preheat to 350 degrees. Season pork inside and out with salt and pepper. Rub with thyme.
Place roast on rack set in large roasting pan.
Mix brown sugar and soy sauce in small bowl. Brush some mixtures over roast. Roast about 2 - 2 hours for medium to medium well, basting occasionally with soy sauce mixture. Transfer pork to platter. Tent with foil and let stand 20 minutes at room temperature.