Your body does not make sodium. You need to intake sodium in order to get it in your body.

Sodium is so important, in fact, that humans have a specific sensor on the tongue that can detect salt. Thousands of years ago, when the diet of humans was potassium-rich and sodium-poor, this sensor for salt was a crucial survival tool. Nature, in her infinite wisdom, devised a way to help humans (as well as animals) seek out salty foods so they could be assured of receiving adequate sodium from their diets. This is important because sodium is often found in the form of sodium chloride or salt plays countless roles in the body.

Sodium is an absolutely necessary mineral for the human body. Without it, nerves and muscles would cease to function, the absorption of major nutrients would be impaired, and the body would not be able to maintain adequate water and mineral balance.

What Are the Sources of Sodium?

Sodium is a regular part of our food supply. It is found naturally in meats, nuts, grains, fruits, vegetables, and dairy products in low amounts. Unfortunately, most of the sodium Americans eat today is added to food in the form of sodium chloride, or table salt. Food manufacturers also add table salt to food in the process of preserving and processing, as well as flavor enhancing. Sodium is also hidden as a part of other chemical additives, such as sodium nitrate, sodium benzoate saccharin, and monosodium glutamate. As a result, many Americans unknowingly consume three to five times more sodium than they need.
Source(s):
http://health.rutgers.edu/factsheets/sodium.htm
http://www.curezone.com/foods/salt/understanding_salt_and_sodium.htm

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