  We have been developing X-ray SOIPIXs, "XRPIX", for future X-ray astronomy
satellites. XRPIX is equipped with a function of "event-driven readout", which
allows us to readout signal hit pixels only and realizes a high time resolution
($\sim10\mu{\rm s}$). The current version of XRPIX suffers a problem that the
readout noise in the event-driven readout mode is higher than that in the the
frame readout mode, in which all the pixels are read out serially. Previous
studies have clarified that the problem is caused by the cross-talks between
buried P-wells (BPW) in the sensor layer and in-pixel circuits in the circuit
layer. Thus, we developed new XRPIX having a Double SOI wafer (DSOI), which has
an additional silicon layer (middle silicon) working as an electrical shield
between the BPW and the in-pixel circuits. After adjusting the voltage applied
to the middle silicon, we confirmed the reduction of the cross-talk by
observing the analog waveform of the pixel circuit. We also successfully
detected $^{241}$Am X-rays with XRPIX.
