The Federation of Small Businesses (FSB) has called for a "radical shift" in the government's approach to broadband deployment.
John Allan, national chairman of the FSB, said the Con-Lib coalition needs to do more to ensure small enterprises have business-grade connectivity.
"With an ever-increasing use of technology small firms need a reliable broadband network," he stated.
"The FSB has long been calling for universal connectivity because it is not acceptable that thousands of small businesses in rural and remote locations are left unconnected."
Mr Allan warned that without a greater focus on deploying broadband services nationwide, many companies will be unable to take advantage of digitalisation.
The government has committed an initial £530 million to the rollout of high-speed and super-fast broadband in rural parts of the UK.
However, progress on carrying out infrastructure work has been slow to date, while concerns have been raised over a lack of competition in the project tender process.