Yes, you can freeze vacuum-packed corned beef, but it is important to keep in mind that freezing may affect the quality of the meat. According to the USDA Food Safety and Inspection Service, “Corned beef bought in a sealed package or with a 'sell by' date can usually be stored according to that date. Fresh corned beef may be refrigerated for about 5 days before cooking; it may also be frozen for up to 3 months if kept at 0°F or lower.”
When freezing corned beef there are certain steps you should take. First, make sure the vacuum-packed corned beef is tightly sealed and wrap it with an additional layer of aluminum foil or plastic wrap. This will help prevent freezer burn which would otherwise cause dry spots on your meat and change its flavor and texture. Additionally, write down the purchase date so that you know exactly how long your vacuum-packed corned beef has been in the freezer and how long it's safe to eat after being cooked!