Place the sliced cucumbers in a medium bowl.
Sprinkle with salt and toss gently to coat.
Let the cucumbers sit for 10 minutes to release extra moisture.
Drain off any liquid from the bowl. Lightly pat the cucumbers dry if needed.
In a small bowl, whisk together soy sauce, rice vinegar, toasted sesame oil, gochugaru, sugar, and minced garlic.
Pour the dressing over the cucumbers.
Add the sliced green onions and toasted sesame seeds.
Toss gently until the cucumbers are evenly coated.
Taste and adjust with more vinegar, soy sauce, or gochugaru if desired.
Serve immediately for the best crunch, or chill for 10 minutes before serving.