In a large mixing bowl, sprinkle the sliced cucumbers with sea salt and allow them to sit for about 15 minutes. This will help draw out excess moisture.
After 15 minutes, gently squeeze the cucumbers to remove any excess water and pat them dry using a clean kitchen towel or paper towels.
In a separate bowl, whisk together the sesame oil, rice vinegar, chili oil, soy sauce, and sugar until the sugar is dissolved.
Pour the dressing over the cucumbers and toss well to ensure the cucumbers are evenly coated.
Add the chopped green onions and toasted sesame seeds to the bowl, mixing gently to incorporate.
Allow the salad to marinate for at least 10 minutes before serving, as this will enhance the flavors.
Serve chilled or at room temperature, garnished with fresh cilantro leaves if desired.