Is there some kind of sandbox or other option that allows to test Google Ads without spending money?

[Nomadtimetraveler]

Just Google Keyword Planner.

No fantasy PPC unfortunately.

[ipswitch00]

Google created the ocean and you pay to fish in it.

[mrasomlith]

Check out PPC Ad Editor. It allows you to build campaigns, ad groups, keywords, ads, etc without a Google Ads account. You can see what your ads look like with all the bells and whistles.

[Cheesypasty]

Tools and settings > planning > ad preview and diagnosis

[tomhalejr]

No. It’s a dynamic auction dependent upon end user interactions.