I have a sidebar with navigation links in a template I am building for an admin
dashboard, something like:
It is for navigation, use
<nav>element represents a section of a page that links to other pages or to parts within the page: a section with navigation links.
<aside>, which does not mean what you think it means;
<aside>element represents a section of the page with content connected tangentially to the rest, which could be considered separate from that content.
<aside> means more "side note" rather than "side bar".
If you wanted, you could use
<aside> to section the side bar then a
<nav> inside it to contain the navigation links