Not exactly low sodium, but definitely high convenience.
Brown beef and onion. Add soup, tomatoes, corn, seasoning, and olives and mix. In a greased 9x13, crush a layer of tortilla chips on the bottom. Spread the meat mix on top. Crush another layer of chips on top; sprinkle with cheese, and bake at 350 till heated through (about 15-20 minutes). If it's going to be in the oven longer, wait a few minutes before topping with the chips and cheese, so they don't get too brown.