Hey,
Does anyone know if this is Possible?

Enter Schengen country in March... spend 30days then exit.
Then Spend the remaining 60days up until the End of the 180th day . Exit and come back the next day to start another 180days ?

Does this work ?

Thanks Christian

No.

Basically you're always counting back 180 days. If during those 180 days you've spent less than ninety days you're okay. Leaving for a day doesn't help. It's not a fixed 180 days. The 180 day window rolls forward every day.

As Nick says No. And don't try it. Even if your passport isn't stamped you are in the system and you will get a nice shiny refused entry/overstayed visa stamp in your passport, which doesn't look great, if you break the rules. Schengen also shares data with non Schengen countries so changing the passport won't help.

There are calculators on line to help you work out how long you can stay.

unless you are a citizen of a country like Australia which has separate arrangements with some Schengen countries.

True, but those arrangements only apply to those specific countries not all of the Schengen countries. It gets complicated then but in the rest of Schengen the 90 days rule still applies.
Also in many EU/Schengen countries if you stay longer than 90 days you are expected to register with the authorities.
Some expect that after even less time.

I did say some Schengen countries and I realize its complicated but it is possible .Like any special arrangement you have to do your homework