Apply for a separate programme the same year
No. If you have not been admitted, you cannot apply for another programme during the same academic year. However, you may apply again for the next academic year (up to three times, starting from the admissions for the 2018 intake).
Please note that if your profile does not match the requirements of the programme you applied for and your application is rejected, the selection committee might decide to consider it for a different programme. Sciences Po will make an admission offer accordingly and you may then decide to accept or decline the offer.