You can can homemade San Marzano pizza sauce for long-term storage if you follow proper canning procedures. Place the filled and lidded jars in a canning pot or large stockpot with a rack. Ensure the jars are covered with at least 1-2 inches of water. Bring the water to a boil and process the jars for the recommended time (typically around 15-20 minutes, but consult your canning guide for exact times based on your location and altitude). Store the sealed jars in a cool, dark, and dry place. Properly canned pizza sauce can last for up to 1-1.5 years.