Where: This change applies to Lightning Experience in accounts that purchased or upgraded to Pardot Advanced Edition on or after February 11, 2019 that are connected to a Salesforce account with Full Sandbox types.
As a beta feature, Pardot Sandboxes is a preview and isn’t part of the “Services” under your master subscription agreement with Salesforce. Use this feature at your sole discretion, and make your purchase decisions only on the basis of generally available products and features. Salesforce doesn’t guarantee general availability of this feature within any particular time frame or at all, and we can discontinue it at any time. This feature is for evaluation purposes only, not for production use. It’s offered as is and isn’t supported, and Salesforce has no liability for any harm or damage arising out of or in connection with it. All restrictions, Salesforce reservation of rights, obligations concerning the Services, and terms for related Non-Salesforce Applications and Content apply equally to your use of this feature. You can provide feedback and suggestions for Pardot Sandboxes in the IdeaExchange.
How: To create a Pardot Sandbox, provision a new business unit from Pardot Account Setup within a Salesforce Full sandbox.