A new distinct cultivar of Osteospermum plant named `Sunny Sabrina`, characterized by its single, daisy type composite inflorescenses with elliptic, acute, ligulate ray florets and tubular disc florets; light to dark purple disc florets, and light red-purple to red-purple ray florets with gray-orange undersides; dark green to yellow-green, large leaves; ovate to spatulate leaves with 6-8 small, acute lobes; and short peduncles, branches and compact bushy plant shape.