Oar said the silence was simply unacceptable.
"We verbally agreed a pay deal for significantly reduced income and haven’t actually heard anything since about returning to training or being paid any differently," he said.
"Seeing our colleagues overseas back playing and other codes in Australia back playing - even in front of crowds as early as this weekend - it makes it hard to justify the constant state of limbo we are in with no decisive action.
"NRL and AFL were criticised for being too bullish in the beginning in order to get back quickly, yet now they have secured their long-term futures.
"In contrast, after three months we are almost exactly where we started."
The A-League is fast approaching the point of no return if the season is to resume in mid-July and be completed by the end of August. Players and coaches who flew overseas will require at least two weeks' notice as they will need to spend 14 days in hotel quarantine upon arrival in Australia, while teams are seeking close to a full month of training before they are fit enough to play matches.
Oar, a PFA delegate, has opted to play out the final rounds of the season with the Central Coast Mariners. The 28-year-old signed a short-term contract extension with the club in the interests of helping to maintain the integrity of the competition, doing so with the blessing of incoming expansion team Macarthur FC, whom he is due to join next season.
He said players had little choice but to accept the conditions and salary reductions put to them by FFA and the clubs but want "long-term solutions" for the sport to be struck in exchange.
"Everything at the moment is looking no more than two or three months ahead, when this is a golden opportunity to change the landscape as everyone has been discussing for years," Oar said.
"No stakeholder should be permitted to hold the league to ransom. There needs to be some brave decisions made to put an end to the stand-off between the stakeholders, as it’s coming at a great cost to players' psychological well-being.
"Football players are often painted to live lavish lifestyles and be completely out of touch with normality ... [but] most A-League players are earning significantly less than our NRL or AFL counterparts, often living off a single modest wage in many cases with families and dependants. Many are currently either on JobKeeper, or in some cases not earning a cent."
Oar also said he was aware of a "divide" between club owners, some of whom he said do not want the season to go ahead - at least on the agreed terms.
"There are so many questions. Fox paid the last instalment, but have the clubs even received it yet from FFA? If not then why not? There’s been no transparency," he said.