It is possible to place a chair right beside the log so that after sitting on it (available in 1.5.x) you can then hop off (into/onto the log?) and basically walk through the log and into the Secret Woods. It is an exploit, and some may call it cheating.
You don't go into the log - basically if you stand right underneath the log, you can place a chair on the tile northwest of you, so that it's on the other side of the log but still adjacent to you. Then you can sit in the chair (since it's adjacent to you), and then you can get out on the other side of the chair, having bypassed the log.
Here's a video:
https://www.reddit.com/r/StardewValley/comments/l5vgiz/you_can_get_into_the_secret_woods_early/
Definitely an exploit, yeah, but it's a single-player game and you get to define what the rules are. (Well, unless it's multiplayer, in which case you and your farmhands get to decide what the rules are, I guess.)
Amusing side note: In single-player, time pauses for the animation of getting in or out of a chair. If you have a bunch of chairs lined up two spaces apart from one spot to another, you can move between them just by getting in and out of the chairs. If you do it right, this actually takes up less in-game time than running between them, because of the pausing.