I can recommend these two resources of the EO college which have been published lately:
- https://eo-college.org/resources/sar-tomography/
- https://eo-college.org/resources/sar-tomography-tutorial/
On GIT: https://github.com/EO-College/tomography_tutorial
It was done with Airborne SAR data but it might help you to find out if it is feasible with Sentinel-1.
PolSARpro also has a Tomography module but I didn’t manage to get results with quadpol ALOS-2 data so far:
Maybe you want to test what I tried with Sentinel-1: Calibration in PolSARpro problem
Studies using TomoSAR on Sentinel-1:
- TomoSAR platform: a new Irstea service as demand for SAR, Interferometry, Polarimetry and Tomography
- Analysis of bistatic tomography for SAOCOM-CS and Sentinel-1 CS missions
- The wet refractivity tomography for improving the InSAR deformation measurements on Mt. Etna
- Tomosar platform supports for Sentinel-1 tops persistent scatterers interferometry