No, sweat does not remove a tan.
While sweating can help to cool the body and remove dirt and bacteria from the skin, it does not have any effect on the melanin production that causes a tan.
A tan is a result of the skin's response to ultraviolet (UV) radiation from the sun. When exposed to UV rays, the skin produces melanin, a pigment that gives the skin its color. This melanin protects the skin from further damage by absorbing UV rays.
Sweating only helps to remove the outer layer of dead skin cells. The melanin produced by the skin remains beneath the surface and is not affected by sweating.
To get rid of a tan, you need to wait for the body to naturally shed the tanned skin cells. This process can take several weeks.
There are other ways to remove a tan, such as using exfoliating scrubs or creams.