What kind of monitoring are you looking to do?
SQL Server exposes a pretty comprehensive range of metrics as WMI performance counters (run the OS utility perfmon to view these). You can quite easily integrate these into Dynatrace - I have done this in the past and it was not difficult even for a relative Dynatrace novice like me.
If you are looking to do more purepath-specific monitoring - e.g. capture the query plan of long running queries - then the only thing I could think is to create an alert that, when triggered, extracted the query plan by querying the dynamic management views. I haven't ever tried that myself.
Here is a link to the SQL Server Standalone Monitoring Plugin: https://community.dynatrace.com/community/pages/vi...
That pulls in a coupe of metrics from SQL Server through the exposed Win Perf Counters