Thank you for contacting the Sitefinity Support.
In general Sitefinity is based on ASP.NET Web Forms which means that all its modules are based on Web Forms and you can't use MVC to create custom modules. However Sitefinity does support ASP.NET MVC and so you can develop custom MVC widgets. You can read more about the MVC support at the official documentation portal
Please do not hesitate to contact us in case you have any further questions or concerns.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items