Perhaps. Unless you consider multiverse theory: The idea that the act of traveling to the past splits the timeline into two realities. One containing the original (to your perspective) timeline with the event(s) that caused you to travel back, and a second where you’ve arrived in the past to alter those events and the results there of.

Not sure I believe it, but it’s a theory none the less.

Or maybe it’s only possible to travel forward in time. Closer to our current understanding of the universe.