Sodium follows water, so as someone else stated above – they are hand in hand.
To your point though, the only way I know of that drinking water can lower sodium – no matter your salt intake – is when you are sick with something called SIADH. Which basically means your kidneys are producing too much of a hormone that makes you not pee enough, therefore causing too much water retention in your body and something called dilutional hyponatremia – low sodium due to dilution.
Homeostasis (your body’s always going for this – equilibrium) prevents this low sodium due to dilution from occurring. Only if something is wrong with your body’s balancing act (like SIADH) will what you are asking actually occur.
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