Preheat grill on medium. Place sausages on oiled grill rack, set 4" to 5" over heat. Grill 7-9 minutes until heated through. Cool slightly & cut into 1/4" slices.
Brush both sides of pizza crust with olive oil. Place crust topside down on rack and grill for 2-3 minutes until warm. Turn crust over. Quickly spread pizza sauce & arrange sliced sausage on top. Sprinkle with cheese & oregano. Grill with cover shut for 8-10 minutes or until cheese has melted. Cut into slices & serve.