The Wales Internet Service Providers Association (Wispa) believes BT should be doing more to improve broadband coverage in the principality.
Richard Brown, the body's Chief Operating Officer, claimed that broadband is "shockingly bad" in Wales, and the UK's leading broadband provider is doing little to change this situation.
He claimed that since BT has a "virtual monopoly" on the UK's telecoms infrastructure, it has a social responsibility to ensure Welsh networks receive an upgrade.
BT is currently investing £2.5 billion readying its network for fibre broadband, although the majority of this fund is being invested in urban areas.
Mr Brown said that BT can help by allowing other broadband providers to use its poles and cable ducts at a reduced rate.
"Wales lacks the ambition at influential levels to be leaders in the digital landscape, and companies such as BT are holding the entire nation behind our global peers," he claimed.
Mr Brown suggested that without public sector funding, BT is unlikely to roll out fibre broadband in many parts of the Welsh principality.
Earlier this week, the Federation of Small Businesses Wales claimed that better broadband is needed to support companies across the country.