You need an Active Directory Domain Services environement to install and use SCOM.
You need a server OS to install it.
cf: https://learn.microsoft.com/en-us/system-center/scom/system-requirements?view=sc-om-2019#software-requirements-for-operations-manager-components
If you are looking for a monitoring solution which does not rely on AD but still integrates pretty well with the Microsoft ecosystem, you can have a look at Azure Log Analytics (in Azure Monitor): https://learn.microsoft.com/en-us/azure/azure-monitor/logs/log-analytics-overview you can install the agent on a Windows machine to monitor whatever you wanted to monitor with SCOM (perf data, event logs...).