Under the arrangement struck with the Football Conference, BT will again show around 25 live games a season from the competition including the play-off semis and final from its main division.
In addition to live games, a new weekly Sunday night highlights show will now feature on BT Sport.
The Conference - which will be re-branded the Vanarama National League from the summer - is also launching its own internet TV service from 2016.
NLTV will be a "very affordable internet subscriber portal" which will offer a daily show with highlights and clips from across the National League's three divisions.
An academy is being set up with BT Sport to train 48 students to film, produce and upload material from the clubs for the new service.