There is a high fiber pasta available online from The Fiber Gourmet. Because the pasta is higher in fiber, it is lower in calories. It is available for purchase in bulk or in packages. I find this is a nice swap for regular pasta, though I don’t care for their version of macaroni and cheese. Your taste may vary.
There is a product called Tofu Shirataki that is available in grocery stores in the produce section (near the tofu, no big surprise). It is a noodle-like product you can use like spaghetti. It has little taste of its own, so you’ll want to sauce it up. Some of my friends enjoy this as a spaghetti alternative, but I do not find it to be as satisfying as actual pasta. You can try it and see how you feel.
Instead of avoiding pasta, you might also try simple swaps to help you choose to eat less of it, or to reduce the overall calories in the meal with which you eat pasta. For example, you could use a different sauce. One way I find effective is to add vegetables to the meal. Start with a salad. Make your pasta main dish with a little flavored olive oil and steamed broccoli, carrots, sauteed red onions, and fresh basil. The bulk of the vegetables means less room in your stomach for the pasta.