Yes. most ranged weapons have either the two-handed or loading property, which means they need both hands for either wielding or re-loading, but slings are the exception, and they only need one hand, leaving your other hand free to have something else in it (my recommendation would be a shield, or use the Magic Stone cantrip).
Cheers! Do you happen to know where this is clarified in the 5e rules? Slings have the “Ammunition” property, which specifies that “you need a free hand to load a one-handed weapon” but I can’t find where it is stated that slings are exempt from this.
