  We present multi-epoch X-ray spectral observations of three Type IIn
supernovae (SNe) 2005kd, 2006jd, and 2010jl, acquired with Chandra, XMM-Newton,
Suzaku, and Swift. Previous extensive X-ray studies of SN 2010jl have revealed
that X-ray spectra are dominated by thermal emission, which likely arises from
a hot plasma heated by a forward shock propagating into a massive circumstellar
medium (CSM). Interestingly, an additional soft X-ray component was required to
reproduce the spectra at a period of ~1-2 yr after the SN explosion. Although
this component is likely associated with the SN, its origin remained an open
question. We find a similar, additional soft X-ray component from the other two
SNe IIn as well. Given this finding, we present a new interpretation for the
origin of this component; it is thermal emission from a forward shock
essentially identical to the hard X-ray component, but directly reaches us from
a void of the dense CSM. Namely, the hard and soft components are responsible
for the heavily- and moderately-absorbed components, respectively. The
co-existence of the two components with distinct absorptions as well as the
delayed emergence of the moderately-absorbed X-ray component would be evidence
for asphericity of the CSM. We show that the X-ray spectral evolution can be
qualitatively explained by considering a torus-like geometry for the dense CSM.
Based on our X-ray spectral analyses, we estimate the radius of the torus-like
CSM to be on the order of ~5 times 10^{16} cm.
