Preheat the oven to 425 degrees F and line a large sheet pan with parchment paper or foil for easy cleanup.
In a small bowl, stir together the soy sauce, honey, olive oil, minced garlic, black pepper, and salt until the honey dissolves.
Place the sweet potato cubes and green beans on the sheet pan. Drizzle half of the honey soy mixture over the vegetables and toss to coat evenly.
Lay the pork tenderloin in the center of the pan. Brush the remaining honey soy mixture over all sides of the pork.
Roast for 25 to 30 minutes until the pork reaches 145 degrees F in the thickest part and the sweet potatoes are fork-tender.
Remove the pan from the oven and let the pork rest for 5 minutes before slicing.