The move brings the total of Scottish Government investment to the National Cycle Network to £6.9m for 2018/19 and will fund a series of infrastructure improvements to make it easier and safer for people to walk and cycle across the country.
Sustrans Scotland Deputy Director Grace Martin said:
"Sustrans will be releasing the results of its National Cycle Network review in November 2018, which will help inform how the network is developed and improved in Scotland over the coming years.
"This additional funding will help create better connected communities and encourage people to walk and cycle more on the journeys they make every day".
The most significant changes to the network will complete two sections of the Caledonia Way (National Cycle Network Route 78), between Campbeltown and Inverness, and develop a new route between Doune and Callander.
The funding will also be used for the completion of construction of Soldiers Bridge in Fort William and enhance existing NCN routes across central Scotland to encourage every day active journeys.