If using wooden skewers on the grill, soak them in water for at least 30 minutes before beginning.
In a small bowl, stir together the sweet chili sauce and sambal until combined. If you want extra sauce for dipping, reserve a small amount in a separate bowl before it contacts raw shrimp.
Thread the shrimp and pineapple chunks alternately onto skewers. Aim for roughly even sizing between shrimp and pineapple. You should get approximately 9–10 skewers.
Using a pastry brush, coat both sides of each skewer generously with the sauce.
Heat the grill to medium-high. Place skewers on the grill and cook for 3 minutes. Brush with any remaining sauce, then flip and cook for another 2–3 minutes, until shrimp are pink, opaque, and cooked through.
Transfer to a serving platter. Garnish with chopped fresh parsley and lime wedges if desired. Serve warm.