I think it might depend on how sodium restricted your friend is. I had a friend who absolutely couldn't eat restaurant food without significant accommodations, like he could order Indian food made without salt from one restaurant that knew him. He couldn't eat bread or cheese as they have too much sodium. At
Disneyland, it's going to depend on how "pre-prepared" the food is at each restaurant. Soups/stews/chili are probably out. Anything with a rub like ribs or chicken is probably out.
That said, I had a chicken and rice bowl kids meal from Galactic Grill, and it seemed very low sodium. The rice was plain white rice and the chicken didn't have a sauce on it. It was marinated in an apricot marinade before cooking, but it wasn't salty at all. It came with vegetables which seemed completely free of seasoning, a mandarin orange, and a yogurt drink. It was a "Disney Check Meal" and while they are specifically low sodium, they do meet certain guidelines and are supposed to be lower in sodium than the other Disney kid meals.