Here the west soy product is called Soy Slender. It has 1 effective carb. I love the stuff and use it almost daily, or at least I did. Unfortunetly I can't find anywhere that sells it here It is sweetened with splenda.

Most soy milks, even the plain kind are loaded with sugars. You could try to find a completely unsweetened one. Make sure to read carb count and ingredients as I've seen soy milks that get really creative in hiding sugars. "dehydrated cane juice" was one alias I saw :P