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The following entry requirements must be observed at the moment (22.10.2021):

Upon entry, a valid Covid-19 PCR test with negative result must be available, which is not older than 7 days upon arrival and was issued by a laboratory certified in the country of departure. The result must be in English. Also for travelers who are vaccinated against Covid-19,  a negative PCR test is required upon entry.

Likewise the completed health questionnaire 1 LINK

The health questionnaire 2 LINK

And the entry form LINK

Travel and safety information - Auswärtiges Amt LINK

Make sure you have adequate travel health insurance coverage.