The sentence is too general to suggest a specific alternative. What is meant by "his time"? His leisure time or his total time (including work, leisure, eating, sleeping, etc.)?
Making a couple of guesses, I recommend, "He uses his time well, so he can engage in leisure activities."
OR (better): "He uses his work time well, so he has more time for leisure activities."
There could be other possibilities. With English, there is almost always more than one way to say the same thing.