Combine soy sauce, water, honey, ginger, garlic, and sesame oil in the instant pot. Add in pork tenderloin, close lid, and seal. Cook on high pressure for 7 minutes, then allow the pressure to release naturally, about another 7 minutes.
Remove pork, then turn instant pot to saute. Combine cornstarch with 2 tsp of water, mixing well, the pour into instant pot. Stir well and saute until thickened, about 2 minutes.
Ladle thickened sauce over pork loin and top with green onions and sesame seeds. Serve over cooked rice or zoodles.