in my experience, soy sauce is going to be high in spite of what version you use. I would just go to the aisle that has it and look at the reduced sodium items available to you at your local supermarket.
one thing that can help is to remember that while it IS high in sodium it should NOT forbidden. measure it out on your food and adapt to the new taste. too many times I would just dump it on without any thought like any other condiment.