Scallops are rich and sweet and can be substituted for shrimp in most dishes. When buying, choose scallops that are similar in size and are pink or ivory (not white).
In a large (12-inch) nonstick skillet over high heat, warm oil, about 1minute; swirl to coat bottom of pan evenly. Add scallops, flat sides down, and cook until browned on both sides, 2 to 3 minutes per side. Season with salt. Transfer to a plate.
Reduce heat to medium. Add onion; cook, stirring, until browned, 1 to 2 minutes. Add ginger, sugar snap peas, and 1/2 cup water; cook, stirring occasionally, until peas are crisp-tender and water has evaporated, about 3 minutes. Remove from heat.
Add scallops, lime juice, chili sauce, and cilantro. Toss to coat. Season with salt, as desired.