- On a voyage of endless learning path
- On an endless voyage to learning path
Neither option is grammatically correct. The main problem is the redundancy of "voyage" and "path:" you can say "I am on an endless path of learning" or "I am on a voyage of endless learning" but you cannot combine the two.
If you simply remove the trailing "path" then the first option becomes acceptable and clear: "On a voyage of endless learning." This means exactly what you want it to mean.
Even if you remove "path," the second option is not idiomatic. You are trying to say that you are continually learning, but if you say you are on "a voyage to learning" that implies that you are trying to start learning once you reach the end of that (endless) voyage. You might make the destination "knowledge" or "enlightenment" or some other goal you can strive towards without truly reaching.