  In the $\rm SU(3)_F$ symmetry limit, using two- and three-particle
distribution amplitudes of $B^{\pm}$-meson for $B_s$, the transition form
factors of semileptonic $B_{s}\to K_{0}^*(1430)$ decays are calculated in the
framework of the light-cone sum rules. The two-particle distribution
amplitudes, $\varphi_{_{+}}(\omega)$ and $\varphi_{_{-}}(\omega)$ have the most
important contribution in estimation of the form factors $f_{+}(q^2)$,
$f_{-}(q^2)$ and $f_{T}(q^2)$. The knowledge of the behavior of
$\varphi_{_+}(\omega)$ is still rather limited. Therefore, we consider three
different parametrizations for the shapes of $\varphi_{_+}(\omega)$ that are
derived from the phenomenological models. Using the form factors $f_{+}$,
$f_{-}$ and $f_{T}$, the semileptonic $B_s \to K_0^*(1430) l \bar{\nu_{l}}$ and
$B_s \to K_0^*(1430) l \bar{l}/\nu \bar{\nu}$, $l=e, \mu, \tau$ decays are
analyzed. The branching fractions for the aforementioned decays, in addition
the longitudinal lepton polarization asymmetries are calculated. A comparison
between our results with predictions of other approaches is provided.
