Hi,
For changing the IP address of SIM server, please refer and follow the document https://support.hpe.com/hpsc/doc/public/display?docId=mmr_kc-0105982.
If possible, decommission the old SIM server first, install the new SIM server with same IP as old SIM has.
Rediscover the devices.
For certificates and using SSO functionality, it may require to push the new certificate to the monitored devices.
Regards,
KK