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I found this way...

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First move the snap package to desired location. Let snap_app.snap as the app you want to move. Move the package from /var/lib/snapd/snaps/snap_app.snap to ~/snaps/snap_app.snap.

Then you have to change mount option in /etc/systemd/system/snap-snap_app-90.mount,number in the file name may be vary. It has directive What=/snap_app_loaction under [Mount]. Change it to your new snap package location.

Finally you have to symlink the snap package to /var/lib/snapd/snaps/.

Ex: ln -s ~/snaps/snap_app.snap /var/lib/snapd/snaps/snap_app.snap

Snap package is originally mount in to /snap/snap_app directory. you can check it with mount. Reboot your machine and you are all done.