What kind of PPI dataset do you want? Do you want a sequence dataset or a structure dataset? You must specify, because there are so many types of datasets. For example, if you want a structure dataset, you can go to the RCSB PDB website and type in the keywords "binary protein-protein complex". It will output all the PDB IDs of the binary PPI structures they have there.

Hello,

very good database of PPI is STRING (https://string-db.org/) - you can search proteins by identifiers or sequences. The whole interaction networks are fully downloadable in various formats.

Thank you for your helpful answer.