  We present the results of our mosaic observations of a single Class 0
protostar IRAS 15398$-$3359 with Atacama Compact Array (ACA) in the CO
$J=2\mbox{-}1$ line. The new observations covering a $\sim\!2'$ square region
revealed elongated redshifted and blueshifted components, which are located at
distances of $\sim\!30''\mbox{-}75''$ on the northern and southern sides of the
protostar, respectively, in addition to the previously observed primary and
secondary outflows. These elongated components exhibit Hubble-law like velocity
structures, i.e., an increase of velocity with increasing distance from the
protostar, suggesting that it is the third outflow associated with the
protostar. Besides, a new redshifted component is detected at radii of
$\sim\!40''\mbox{-}75''$ on the northwestern side of the protostar. This
redshifted component also exhibits a Hubble-law like velocity profile, which
could be the counterpart of the secondary outflow mostly detected at
blueshifted velocities in a previous study. The three outflows are all
misaligned by $\sim\!20\mbox{-}90^\circ$, and the dynamical timescale of the
primary outflow is shorter than those of the other outflows approximately by an
order of magnitude. These facts hint that the outflow launch direction has
significantly changed with time. The outflow direction may change if the
rotational axis and the magnetic field are misaligned, or if the dense core is
turbulent. We favor the second scenario as the origin of the multiple outflows
in IRAS 15398$-$3359 based on a comparison between the observational results
and numerical simulations.
