Yes, coconut oil can help you tan faster.  It makes it easier for the UV rays to reach the melanocytes in the skin and increase melanin production.  However, because of this, using coconut oil can also make you burn more easily and more quickly.  Choosing the best time to tan outside of the peak of the day would be advisable if you want to use coconut oil to tan more quickly.  This can reduce the chances that you’ll develop a burn.