  The extended quantum molecular dynamics (EQMD) model is one of the few
quantum molecular dynamics (QMD)-like transport approaches that can be used to
study the effective clustering structure as well as heavily deformed nuclei in
both ground state nuclei and nuclear reactions. However, there are only two
parameter sets that lead to hard incompressibility for long times. The aim of
the present work is to obtain a soft equation of state (EoS) in the EQMD model.
In this context, we take the isoscalar giant monopole resonance (ISGMR), which
is sensitive to the EoS, as an example to check our work. By introducing a kind
of standard Skyrme energy density functional with different parameter sets,
such as SkP, SkT1, and SKXce, whose incompressibility value ranges from 200 to
268 MeV, the ISGMR of $^{208}$Pb and other nuclei are studied. When the SkP
parameter sets are adopted, our new soft interaction in the EQMD model gives
reasonable agreement with the experimental data in the heavy ion regime.
