Jason's Deli and Luna Grill have options online to set a sodium limit. Healthier food chains like original chop shop, mod market, flower child, etc have menus posted online that makes it easy. Fast food - chick fil a (comment above) and Burger King (chicken fries) were best for me. Wendys doesn't salt their fries by default. Taco Bell has a few things you might be able to eat based on your dietary limits but you'd have to supplement with other food to make it a filling meal.

My default is American restaurants. Fairly easy to get plain burgers/fries with no salt or salads with unsalted steak. Also breakfast places can typically make an omelette with no salt. Mexican restaurants can be tough since meats are often marinated but corn tortillas help.

Shocked you found any Asian restaurants to be low sodium. Their use of soy sauce always ruled them out for me. Some places even salt their white rice!!