True ETL Tools
If you need more than just to copy data from Google BigQuery to Snowflake, you may use Skyvia's powerful ETL functionality for Google BigQuery and Snowflake integration. Skyvia's Import tool will correctly extract Google BigQuery data, transform it, and load to Snowflake when Snowflake tables have different structure than Google BigQuery tables. Besides, if you ever need to load data back from Snowflake to Google BigQuery, Skyvia Import allows loading data in any direction, supporting Reverse ETL scenario.
For more complex cases, you can use Data Flow and Control Flow tools. They are designer-based solutions for creating complex data pipelines, involving not only Google BigQuery and Snowflake connectors, but any number of connectors in one integration. With these tools you can automate data workflows, involving custom logic, complex multistage transformations, combine data from different sources, load them into multiple destinations at once and many more.