Heat grill to medium heat.

Place half the ribs in single layer on large sheet of heavy-duty foil. Combine sugar and seasonings; rub half evenly onto both sides of ribs. Bring up foil sides. Double fold top and one end to seal packet. Add 1/4 cup water to packet through open end. Double fold remaining end, leaving room for heat circulation inside. Repeat with remaining ribs to make second packet.

Grill 45 min. to 1 hour or until ribs are done. Remove ribs from foil; discard foil.

Return ribs to grill; brush with half the barbecue sauce. Grill 15 min., turning and brushing occasionally with remaining barbecue sauce.