Try spaghetti squash as an alternative. Or sometimes I grate zucchini and put meat sauce over it. I've heard of people using shredded cabbage or french style green beans.
Quinoa (pronounced Keen-Wah) is a south american grain (well, really a seed) that is high protein and you can substitute it in some recipes.. I use it in place of rice sometimes.
Pasta & noodles, while not only filling you up too quickly and high carb, also tend to be high glycemic. Short version is that they spike your blood sugar and when the sugars in your blood drop back down, you're hungrier sooner.
If you want to learn more about the GI (glycemic index) check out http://www.glycemicindex.com/