I don't like the reference to 'sandbox'. There is quite a confusion out there regarding what VM means. But 'sandbox' is quite specific: an environment to execute untrusted code within OS. DomU may be a better term. Also, I would stick to LING VM instead of LING Virtual Machine. A better phase could be like this:

The LING VM runs as Xen guest in its own DomU which makes it a great fit for highly secure applications.