The college board score report indicates that they send every previously completed test, SAT(s) and subject tests. It appears that the only way colleges wouldn't get your subject test scores is if you took the SAT and sent the scores prior to your taking the subject test(s).
You can wait and do the SAT "score choice" method after test results are back and then you are able to select the specific test scores that you want to send. It will only send the test sittings that you make a check mark to send. It lists the subject tests separately so you can choose if you want to send one, all or none of your subject test scores.