Cook the couscous according to the package directions. Meanwhile, heat the oil in a large saucepan over medium-high heat. Add the onion and cook, stirring occasionally, for 4 minutes. Add the tomatoes, olives, wine, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Simmer, stirring occasionally, until slightly thickened, 4 to 6 minutes. Add the shrimp, cover, and cook until the shrimp are cooked through, 3 to 5 minutes. Serve with the couscous.
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