Would it be possible for you to inform us which version of Sitefinity you are using?
Sitefinity is built on top of the Provider Model pattern. In order to get data from a different source for your custom module, you must provide your own implementation for your module provider. For example look at this article:
You can simplify this task by using Sitefinity Thunder Visual Studio add-in. It will helps you not only to implement your provider but also for the registration in Sitefinity and its usage. Take a look at the examples that Sitefinity Thunder provides on its start page when you install it in Visual Studio.
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