It depends on what kind of entropy you are computing. If itthe problem is computing an entropy offor $N$ particles occupying a $M$ number of energy levelsstates, then your multiplicity will be taking discreete values, and your entropy will be discrete as well.
If it is a problem of computing entropy for $N$ particles distributed in $(\vec{x}, \vec{p})$ phase space, multiplicity will be continuous, and the entropy will be continuous too.
Finally, if you consider magnetic particles, which have two- or three-dimensional magnetization vector, then you Hamiltonian, your partition function, and, hence, the entropy will all be continuous.