Yes in-deedily, of course there is… However, there are multiple answers, really only one of which is correct: VPN to the remote network where your MyBook is located, mount and off you go.
A few pieces of information, while Apple has announced their intention to move to SMB2 for alll client communications, Time Machine still relies on the Apple Filing Protocol (AFP) which runs over TCP
548. You can trick it to using SMB2 (lifehacker.com: an-easier-way-to-set-up-time-machine-to-back-up-to-a-networked-windows-computer), however either of these methods still requires access to the storage via insecure protocols; therefore, VPN highly recommended/mandatory IMHO.
If you're not a network freak and don't have an enterprise/business firewalll on your personal home network, new-ish models from the big guys, both wired and wireless (like the R7000), are starting to include easy to operate (albeit less capable than enterprise/business, but far less expensive) options for this implementation.
Best of luck~
