You can download a specific sheet using the ‘GID’.
Each sheet has a GID, you can find GID of specific sheet in the URL of
spreadsheet. Then you can use this link to download specific sheet –
https://docs.google.com/spreadsheets/d/<KEY>/export?format=xlsx&gid=<GID>
ex:
https://docs.google.com/spreadsheets/d/1D5vzPaOJOx402RAEF41235qQTOs28_M51ee5glzPzj0/export?format=xlsx&gid=1990092150KEY is the unique ID of the spreadsheet.
source: https://www.quora.com/How-do-I-download-just-one-sheet-from-google-spreadsheet/answer/Ranjith-Kumar-339?srid=2YCg