Right now in 1.2 you'll have to just add the submodule to your bookmarks separately (it's a repo in its own right).
SourceTree 1.3 is approaching completion which has full support for submodules and subrepositories. It not only displays them in the sidebar with details of uncommitted or unpushed changes, but it also allows you to commit your changes and push them from within the parent repository, at the same time (well, just before) you commit/push the parent. There should be a beta to play with available later this month, keep an eye on @sourcetree on Twitter for details.
Supported Platforms macOS Windows We recently introduced support for additional hosting services such as GitHub Enterprise, GitLab (Cloud, Community Edition, Enterprise Edition), and...
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