Yup, you can't avoid the salt if you like original Soy Sauce, even with the low(er)-sodium versions. It's just the way its made.
But if you like your Soy Sauce taste and don't want the salt, here is a recipe to try:
Soy Sauce Replacement
2 cups vegetable stock
4 teaspoons red wine vinegar
2 teaspoons molasses
1/2 teaspoon ground ginger
1 teaspoon white pepper
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
1 teaspoon corn flour
Put all ingredients except cornflour into a saucepan and bring to the boil. Boil for 5 minutes.
Reduce heat and simmer until reduced.
Add cornflour for thicker sauce.
Support bacteria. It's the only culture some people have.