If I had a rosary for every time I made a PSA on how to unlock a bench in Hollow Knight: Silksong, I'd have two rosaries, which isn't a lot but it's weird that it's happened twice. While the Hunter's March bench was a pain in the thorax, the Sinner's Road is a different beast entirely.
This area (filled with terrible dogs) does have a bench smack-dab in the middle of it, but it takes a bit of fixing before you're able to actually kick your feet up. The route you'll need to take looks a little like this:
