Preheat an oven to 180 degrees C. Grease a 2 1/2 litre baking dish.
Bring a large pot of lightly salted water to a boil. Place pasta in the pot, cook for 8 to 10 minutes until tender and drain.
Cook and stir the pork in a large frypan over medium heat until browned, about 8 to 10 minutes. Drain the fat from the meat, pour the cooked pasta and spaghetti sauce into the frypan and stir well to combine. Bring the mixture to a boil.
Pour half of the hot pasta-sausage mixture into the prepared baking dish, spread with the cottage cheese in an even layer and sprinkle with half the mozzarella cheese. Spread the remaining pasta mixture over the cheese and top with the remaining mozzarella cheese.
Cover and bake in the preheated oven for about 25 minutes until the casserole is hot and the cheese is melted and bubbling. Let it stand 5 minutes to firm up before serving.