Multisite is actually a form of WordPress. WooCommerce is a plugin that functions within the WordPress Content Management system (for more on the difference between WordPress and WooCommerce see this article) So there isn't actually a "plugin" that makes WooCommerce multisite. The WordPress CMS comes in ultimately 2 very related forms WordPress Single Site Install WordPress Multisite Network To make a "WooCommerce Multisite Network" you're ultimately creating a "WordPress Multisite Network" that has the WooCommerce plugin installed on all sites.