Preheat oven to 425°F and line a large sheet pan with parchment paper.
In a small bowl, whisk together balsamic vinegar, honey, 1 tablespoon olive oil, minced garlic, and rosemary.
Pat pork tenderloin dry and season generously with salt and pepper, then place in the center of the sheet pan.
Toss potatoes and green beans with remaining 1 tablespoon olive oil, salt, and pepper, then arrange around the pork.
Brush half of the balsamic glaze over the pork tenderloin.
Roast for 20-25 minutes, brushing pork with remaining glaze halfway through, until pork reaches an internal temperature of 145°F.
Remove from oven, tent with foil, and let rest for 5 minutes before slicing and serving.