  We derive a simple Woods-Saxon type form for the potentials between $Y=\Xi,
\Omega$ and $\alpha$ by using a single-folding potential method, based on a
separable $Y$-nucleon potential. Accordingly, the potentials $\Xi+\alpha$ and
$\Omega+\alpha$ are obtained using the ESC08c Nijmegens $\Xi N$ potential
  (in $^{3}S_{1}$ channel) and HAL QCD Collaboration $\Omega N$ interactions
  (in lattice QCD), respectively. In deriving the potential between $Y$ and
$\alpha$, the same potential between $Y$ and $N$ is used. Binding energy,
scattering length and effective range of $Y$ particle on the alpha particle are
approximated by the resultant potentials. The depths of the potentials in
$\Omega \alpha $ and $\Xi \alpha $ systems are obtained $-61$ and $-24.4$ MeV,
respectively. In the case of $\Xi \alpha$ potential, a fairly good agreement is
observed between the single-folding potential method and the phenomenological
potential of Dover-Gal model. These potentials can be used in 3-,4- and 5-body
cluster structures of $ \Omega$ and $\Xi$ hypernuclei.
