While not strictly a template, the Quality Matters (QM rubric) can help you to think through the best practices for online course design.
Quality Matters Higher Education Course Design Rubric – A rubric designed by a national, non-profit organization to help instructors ensure their courses meet quality standards for online course design. UNCW has a license agreement with QM, allowing you to create a membership account and access the rubric.
You must have UNCW credentials to access the rubric. Sharing the rubric outside of UNCW is strictly prohibited.