Begin by washing the cucumbers thoroughly. Cut off the ends and then smash each cucumber with the flat side of a knife or a rolling pin until they crack open but remain intact.
Cut the smashed cucumbers into bite-sized pieces and place them in a large bowl.
Sprinkle the salt over the cucumbers and let them sit for about 10 minutes to draw out excess moisture.
In a separate bowl, whisk together the rice vinegar, soy sauce, sesame oil, sugar, minced garlic, and grated ginger until well combined.
After 10 minutes, drain any excess liquid from the cucumbers.
Pour the dressing over the cucumbers and toss gently to coat.
Sprinkle sesame seeds and sliced green onions on top before serving.
For best flavor, let the salad chill in the refrigerator for at least 15 minutes before serving.