  A helicity asymmetry for top quarks originating from Higgs boson decays is
investigated within the 2-Higgs Doublet Model. The asymmetry is sensitive to CP
violation in the scalar sector of the model, whereas it vanishes in the
Standard Model. It has been checked that without any fine tuning of parameters
the asymmetry can reach $50\%$. Standard decay patterns $\twbdec$ and
$\tbwbdec$ are utilized as spin analyzers to measure the asymmetry. The Higgs
production mechanism considered here is $\hprod$. It has been shown that signal
from the asymmetry can easy overcome the noise for Higgs bosons produced in
future linear $\epem$ colliders at energy $\sqrt{s}=500\gev$ operating with
integrated luminosity $L=2.0\times10^4\lumun$.
