Yes, you can connect with these sources.
You can find information about SAP as a data source in section "Multidimensional Database Sources" of the "[Virtual DataPort Administration Guide](https://community.denodo.com/docs/view/document/Virtual%20DataPort/Denodo%206.0/Virtual%20DataPort%20Administration%20Guide)". Besides, you can find more information in the document "[Denodo and SAP Best Practices](https://community.denodo.com/kb/view/document/Denodo%20and%20SAP%20Best%20Practices?category=Data+Sources)" of the knowledge base.
Related to Salesforce, there is available the [Denodo Salesforce custom wrapper](https://support.denodo.com/resources/denodo-connect/details/1298) in the "[Denodo Connects](https://support.denodo.com/resources/denodo-connect/list/Denodo%206.0)" section.
Hope this helps!