  The Cassini mission in the Saturnian system is an outstanding opportunity to
improve our knowledge of the satellites of Saturn. The data obtained thanks to
this mission must be confronted to theoretical models. This paper aims at
modeling the rotation of Mimas, with respect to its possible internal
structure. For that, we first build different interior models, in considering
Mimas as composed of 2 rigid layers with different porosity. Then we simulate
the rotational behavior of these models in a 3-degree of freedom numerical
code, in considering complete ephemerides of a Mimas whose rotation is
disturbed by Saturn. We also estimate the deviation of its longitudinal
orientation due to tides. We expect a signature of the internal structure up to
0.53{\deg} in the longitudinal librations and an obliquity between 2 and 3
arcmin, the exact values depending on the interior. The longitudinal librations
should be detectable, inverting them to get clues on the internal structure of
Mimas is challenging.
