Pour oil into a 12-inch frying pan or a 14-inch wok over medium-high heat. When hot, add sausage and stir often until slightly browned, 1 to 2 minutes. Add onion, garlic, and okra; stir often until onion is limp, about 5 minutes.
Gently mix in rice and Cajun spice blend; stir occasionally until the rice is hot and golden and the okra is tender, about 5 minutes. Pour into a serving bowl.