Cook the spaghetti noodles according to package instructions. Set aside.
Heat-up the grill and start grilling the Italian sausage in low heat. Grill the sausages until the inside is completely cooked (around 15 to 25 minutes).
Remove the sausage from the grill. Let it rest for 10 minutes. Slice the sausages diagonally.
Make the marinara sauce by following this marinara sauce recipe. Once the sauce is ready, add the sliced sausage and continue to cook for 5 minutes. Add additional salt and pepper, if needed.
Arrange the spaghetti noodles in a pasta bowl. Top with marinara sauce with Italian sausage.
Sprinkle with chopped basil and Parmesan cheese on top.