Yes, in some cases admission is possible even without applying online . If you want to take admission in a college or university, and have missed applying online, you can apply offline by visiting the concerned institute. Many institutes accept offline applications, especially for those students who have not been able to apply online for some reason.  For example state universities.

However, it is important to note that not all institutes accept offline applications, so you must first find out if your chosen institute accepts offline applications.